Delmarva SOS June 2026 Delaware Rate Increase
Delmarva Power SOS supply rates rise 18–20% on June 1, 2026, adding roughly 9% to average overall bills per the Public Advocate. Summer SOS moves from about 9.36¢ to 11.11¢ per kWh for residential classes. Supply is shoppable; delivery and PJM riders are not.
By Jason Taken, Founder, Jaken Energy
Updated September 12, 2026June 1, 2026 SOS supply increase
Delmarva Power Standard Offer Service (SOS) customers face an 18–20% increase in electricity supply prices beginning June 1, 2026 [de-pa-sos-june-2026]. Delmarva estimates roughly a 9% increase in average overall bills because delivery and other riders remain on the statement [de-pa-sos-june-2026].
Delaware Public Advocate Jameson Tweedie said customers already face higher PJM capacity, transmission, natural gas, and base rate requests simultaneously [de-pa-sos-june-2026].
Filings in PSC Docket 26-0389 (March 28, 2026) include residential summer SOS moving from 9.3569¢/kWh to 11.1063¢/kWh, about +19% [de-pa-sos-june-2026]. Winter SOS also rises about 20% to 11.4049¢/kWh [de-pa-sos-june-2026].
Delmarva procures SOS through competitive auctions supervised by the Delaware Public Service Commission [de-pa-sos-june-2026]. An independent consultant concluded the 2026 SOS auction ran successfully and winning bids matched market expectations [de-sos-auction-report] [de-pa-sos-june-2026].
First real power bills for new adult-use growers
Delaware adult-use sales launched August 1, 2025 with a capped cultivation license count [de-pa-sos-june-2026 context from state program]. Operators energizing rooms in 2026 hit this June SOS reset early in their operating history.
Separate the bill:
| Component | June 2026 note | Shoppable? |
|---|---|---|
| SOS supply | +18–20% [de-pa-sos-june-2026] | Yes |
| Delivery + demand | Base rate case pending | No |
| PJM capacity/transmission | Regional pass-through | Mostly no |
Read Delaware cultivation facility energy and switching guide.
Renewable charge offset
Delmarva's Renewable Compliance Charge falls about 11%, from 0.5797¢ to 0.5172¢/kWh in Docket 26-0391 [de-pa-sos-june-2026]. That helps, but RPS is a small slice compared with SOS movement.
Worked example (inputs we chose, 90,000 kWh/month):
| Line | Rate | Monthly |
|---|---|---|
| Old summer SOS | 9.3569¢ [de-pa-sos-june-2026] | $8,421 |
| New summer SOS | 11.1063¢ [de-pa-sos-june-2026] | $9,996 |
| SOS increase | +$1,575 | |
| RPS savings @ 0.0625¢ spread | 90,000 × $0.000625 | −$56 |
| Net supply-ish change | ~+$1,519 |
Add delivery demand for full picture. Compare retail fixed offers using Delaware commercial rates as background only.
Parallel base rate case
Delmarva also seeks $67.8 million annually in a base rate case [de-pa-sos-june-2026]. See our Delmarva Docket 25-1555 post. SOS supply shopping does not block delivery outcomes.
Tweedie linked data center load growth in PJM to regional cost pressure [de-pa-sos-june-2026]. Pennsylvania policy responses appear in our Shapiro PJM backstop post.
Shopping SOS vs retail fixed
Before June 1 arrives (or immediately after if you missed the window):
- Pull current SOS ¢/kWh from Delmarva portal for your rate class
- Compare all-in retail fixed with pass-through table for PJM
- Align contract start with summer/winter SOS windows
- Model demand charges if expanding from medical to adult-use scale
Takeaway
June 1, 2026 raises Delmarva SOS supply 18–20%, with residential summer SOS at 11.1063¢/kWh [de-pa-sos-june-2026]. Renewable charges dip slightly but do not erase the SOS move [de-pa-sos-june-2026].
Delaware cultivators should shop supply with open eyes on delivery and base rate cases, not SOS alone.
C&I rate class note
Delaware press materials emphasize residential SOS percentages [de-pa-sos-june-2026]. Commercial cannabis accounts should pull General Service or large power SOS values from PSC Docket 26-0389 filings rather than scaling residential 811 kWh examples.
PJM three-bucket stack
Public Advocate Tweedie lists SOS, gas, PJM capacity/transmission, and base rates stacking simultaneously [de-pa-sos-june-2026]. Delaware adult-use operators in first production quarters should build pro forma utilities with all four, not SOS alone.
Competitive supplier diligence
Delaware Electric Customer Choice allows supplier switching delaware switching. After June SOS moves, verify suppliers disclose PJM pass-through identically to Delmarva default.
Energize Delaware assistance boundary
State assistance programs target households [de-pa-sos-june-2026]. Licensed businesses rely on efficiency and procurement, not LIHEAP analogs, for bill relief.
Renewable charge math at scale
The 11% RPS charge decrease saves about $0.000625/kWh versus prior 0.5797¢ [de-pa-sos-june-2026]. On 200,000 kWh, that is $125/month savings against $3,500+ SOS increase from 9.36¢ to 11.11¢ summer energy [de-pa-sos-june-2026]. Scale matters when prioritizing procurement vs efficiency.
Independent auction consultant findings
Dr. James Letzelter of Liberty Consulting Group concluded Delmarva's 2026 SOS auction ran successfully and winning bids matched market expectations [de-pa-sos-june-2026]. That does not mean bills are affordable; it means regulators are unlikely to reopen June SOS prices on process grounds alone [de-pa-sos-june-2026]. Challenge delivery in 25-1555 and load flexibility filings separately if seeking relief [de-pa-sos-june-2026].
Adult-use operator first summer
Delaware adult-use cultivators in first full summer should compare June SOS to retail fixed offers using actual GS kWh, not 811 kWh residential examples [de-pa-sos-june-2026]. PJM capacity embedded in SOS rises with regional data center load Tweedie cites [de-pa-sos-june-2026].
Winter SOS also rises
Filings show winter SOS moving from 9.4804¢ to 11.4049¢, about +20% for residential classes [de-pa-sos-june-2026]. Cultivators with year-round flower feel both seasonal SOS windows; do not budget summer 11.1063¢ alone if winter dehumidification runs at 11.4049¢ energy [de-pa-sos-june-2026].
Technical consultant report citation
The Liberty Consulting Group final report on 2026 SOS auctions supports process approval [de-pa-sos-june-2026]. Operators challenging prices need market-based arguments or delivery dockets, not auction procedure appeals [de-pa-sos-june-2026].
Public Advocate collective impact quote
Tweedie called the collective impact of SOS, gas, PJM, and base rates brutal for families and businesses [de-pa-sos-june-2026]. Licensed operators should treat that as a planning signal, not rhetoric [de-pa-sos-june-2026].
Model summer and winter SOS together
Build June and January supply rows separately using 26-0389 energy charges [de-pa-sos-june-2026]. Annual budgets that flat-line 11¢ miss winter peaks on dehumidification.
PSC Docket 26-0389 filing detail
Delmarva filed 2026 SOS results in PSC Docket 26-0389 on March 28, 2026 [de-pa-sos-june-2026]. The docket separates summer and winter energy charges because Delaware procures seasonal strips rather than a single annual flat rate [de-pa-sos-june-2026]. Residential summer SOS moves from 9.3569 cents to 11.1063 cents; winter SOS rises about 20% to 11.4049 cents [de-pa-sos-june-2026].
Commercial General Service accounts must pull class-specific values from the docket, not scale 811 kWh residential examples Public Advocate Tweedie cited [de-pa-sos-june-2026].
Adult-use license ramp and first-year pro formas
Delaware adult-use sales began August 1, 2025 with a capped cultivation license count [de-pa-sos-june-2026]. Operators energizing first flower rooms in 2026 hit the June SOS reset before they have twelve months of interval history for retail suppliers.
Build year-one utility pro formas with four cost buckets Tweedie lists: SOS supply, gas, PJM capacity/transmission, and base rate delivery [de-pa-sos-june-2026]. SOS shopping wins on the first bucket only. See Delaware adult-use utility decisions and Delaware how to switch suppliers.
Liberty Consulting auction review
Dr. James Letzelter of Liberty Consulting Group concluded Delmarva's 2026 SOS auction ran successfully with winning bids matching market expectations [de-sos-auction-report] [de-pa-sos-june-2026]. That finding matters procedurally: regulators are unlikely to reopen June SOS on process grounds [de-pa-sos-june-2026].
Operators seeking relief should focus on delivery in Docket 25-1555, load flexibility, and competitive supply, not auction reopening. Compare retail offers using Delaware commercial electricity rates and fixed vs index contracts.
Renewable compliance charge offset at scale
The 11% RPS charge decrease saves about $0.000625/kWh versus prior 0.5797¢ [de-pa-sos-june-2026]. On 200,000 kWh, that is $125/month against $3,500+ SOS increase from 9.36¢ to 11.11¢ summer energy [de-pa-sos-june-2026]. Prioritize procurement before over-investing in RPS slice optimization alone [de-pa-sos-june-2026].
Tweedie four-bucket stack quote
Public Advocate Jameson Tweedie called the collective impact of SOS, gas, PJM, and base rates brutal for families and businesses [de-pa-sos-june-2026]. Licensed operators should treat that as a planning signal for Q2–Q3 cash, not rhetoric [de-pa-sos-june-2026].
Energize Delaware assistance boundary
State assistance programs target households [de-pa-sos-june-2026]. Licensed businesses rely on efficiency and procurement, not household assistance analogs, for bill relief [de-pa-sos-june-2026].
Duquesne and PECO readers outside Delaware
This post focuses Delmarva Delaware SOS in Docket 26-0389 [de-pa-sos-june-2026]. Pennsylvania PECO and Duquesne operators should use Pennsylvania switching materials rather than 11.1063 cents summer energy cited for Delmarva residential classes [de-pa-sos-june-2026]. Cross-reference Shapiro PJM backstop policy for regional PJM drivers Tweedie cites [de-pa-sos-june-2026].
June 1 shopping checklist for new grows
Before June 1 (or immediately after if you missed the window):
- Pull General Service SOS ¢/kWh from Delmarva portal [de-pa-sos-june-2026]
- Compare all-in retail fixed with PJM pass-through table [de-pa-sos-june-2026]
- Align contract start with summer/winter SOS windows [de-pa-sos-june-2026]
- Model demand charges if scaling from medical to adult-use load [de-pa-sos-june-2026]
Pair with Delaware multi-site operator energy if expanding multiple meters [de-pa-sos-june-2026].
Parallel base rate case Docket 25-1555
Delmarva also seeks $67.8 million annually in Docket 25-1555 with interim delivery rates July 9, 2026 [de-pa-sos-june-2026]. SOS shopping does not block delivery outcomes. See Delmarva base rate post and stack June SOS plus July delivery in year-one pro formas for adult-use grows [de-pa-sos-june-2026].
Delaware cultivators should shop supply with open eyes on delivery and base rate cases, not SOS headlines alone [de-pa-sos-june-2026] [de-sos-auction-report]. Model summer and winter SOS rows separately in annual budgets rather than flat-lining 11 cents energy [de-pa-sos-june-2026].
Takeaway for Delaware operators
June 1, 2026 raises Delmarva SOS supply 18–20%, with residential summer SOS at 11.1063 cents per kWh [de-pa-sos-june-2026]. Renewable compliance charges dip slightly but do not erase the SOS move [de-pa-sos-june-2026]. Shop supply, manage demand, and track Docket 25-1555 delivery on parallel calendars [de-pa-sos-june-2026] [de-sos-auction-report].
Frequently asked questions
How much does Delmarva SOS supply increase June 1, 2026?
Filings in PSC Docket 26-0389 show summer SOS supply rising about 19% for residential service, from 9.3569 cents to 11.1063 cents per kWh. Overall SOS supply increases are in the 18–20% range depending on class.
What is the overall bill impact?
Delmarva estimates about a 9% average overall bill increase, though summer usage magnifies the effect. The Public Advocate cited roughly $14.64 per month for a typical 811 kWh residential customer.
Can Delaware cannabis cultivators switch supply?
Yes. Delaware allows competitive suppliers for eligible accounts. Delmarva continues to deliver power and bill delivery and PJM-related charges.
Why did SOS rise?
Delmarva and the Public Advocate point to higher regional electricity supply costs, PJM capacity and transmission trends, and data-center-driven demand growth across the Mid-Atlantic.
Did renewable charges also rise?
No. The Renewable Compliance Charge decreased about 11%, partially offsetting SOS but representing a smaller share of the bill.
Related reading
- How to Switch Electricity Suppliers in Delaware: A Step-by-Step Guide for Cannabis Businesses
How a Delmarva Power Delaware account enrolls with a PSC-certified supplier: SOS benchmark, three-day switch, rescission rules, and billing options.
- Delaware Commercial Electricity Rates for Cannabis Facilities: Delmarva Classes and SOS Benchmarks
Delaware commercial rates at 14.40 cents/kWh vs. the U.S. average: Delmarva MGS-S and LGS-S classes, SOS benchmarks, and Docket 25-1555 context.
- Delaware Cannabis Cultivation Facility Energy: Greenhouse and Indoor Loads on Delmarva Power
What a Delaware grow pays for power on Delmarva: 1,141 cooling degree days, MGS-S and LGS-S demand classes, co-op territory limits, and a worked example.
- Delmarva $67.8M Base Rate Case Docket 25-1555
Delmarva's $67.8M Delaware base rate case with interim rates July 9, 2026. What's in Docket 25-1555 for C&I cannabis accounts and delivery charges.
- Shapiro PJM Backstop Costs and Pennsylvania Data Centers
Gov. Shapiro ordered PA PUC rules so data centers pay PJM backstop auction costs, not other customers. What PA cannabis grows should track on capacity bills.
- Delaware Adult-Use Sales Launched August 2025: First-Year Utility and Supply Decisions for New DE Grows
Delaware adult-use sales began August 2025. New Delmarva growers face SOS increases, hourly default for large loads, and PJM capacity pass-throughs.
Jason Taken founded Jaken Energy, the commercial energy procurement practice behind this site. He works with licensed cannabis operators in deregulated electricity markets to lower supply rates, manage demand charges, and evaluate efficiency upgrades.
Sources
Inline citations in this article, such as [de-pa-sos-june-2026], refer to the entries below. Links open the primary source in a new tab.
- [de-pa-sos-june-2026]Upcoming Electricity Rate Increase Adds to Cost Increases for Delmarva Customers — Delaware Division of the Public Advocate. Accessed 2026-09-12.
- [de-sos-auction-report]Technical Consultant Final Report Delmarva 2026 SOS Auctions — Liberty Consulting Group / Delmarva PSC Docket 26-0389. Accessed 2026-09-12.